Question about 1996 Jeep Grand Cherokee

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Engine runs then suddenly dies.Replaced crank sensor , cam sensor, ignition coil also swapped PCM from a know good vehicle.

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Is the cat plugged? if unknown buy or make a test pipe to see if that's it.

Posted on Oct 01, 2010

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1 Answer

Do a 2004 Envoy SLT 4.2L have a Ignition Module?


Crankshaft position sensor,cam sensor . your vehicle should have coil on plug , a coil at each spark plug !
Ignition Coils
Each ignition coil has an ignition 1 feed and a ground. The PCM supplies an ignition control (IC) circuit. Each ignition coil contains a solid state driver module as its primary element. The powertrain control module (PCM) signals the coil driver to initiate a firing event by applying a signal to the IC circuit at the appropriate time. When the signal is removed, the coil fires the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
During normal operation the powertrain control module (PCM) controls all ignition functions. If either the crankshaft position (CKP) or camshaft position (CMP) sensor signal is lost, the engine will continue to run because the PCM will default to a limp home mode using the remaining sensor input. As mentioned above, each coil is internally protected against damage from excessive voltage. If one or more coils were to fail in this manner, a misfiring condition would result. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.
If a crank sensor is replaced a Crankshaft Position System Variation Learn must be done and a scan tool is need to do this.

Nov 30, 2016 | 2004 GMC Envoy SLT

1 Answer

Truck won't start


If by your description I'm assuming you say "NO START" you mean it cranks but don't start..? Depending on the YR, make & model Poss. defective module? or switch itself, pickup (if app) Wrong plugs, mass air flow sensor (if app) Any C/E LTS? Scan PCM , also ck coolant system readings & ck emissions when running., crank & cam sensors are popular for that problem along with the module and pickup coil too. It's Long list but I would start with a scan of the PCM & check those crank & cam sensors 1st. Good Luck

Nov 26, 2015 | Cars & Trucks

1 Answer

My 1991 oldsmobile eighty eight royale keeps dying when i drive it, I have replaced ing control moduel, fuel pump, mass air flow , cam shaft sensor, timing chain, plugs wires ect. do i need to keep...


With that much already invested, why give up now? How about the crank position sensor-was that replaced as well? For spark control and spark timing, the computer needs inputs from both the cam position sensor and the crank position sensor before it can know when to cut power to the coils for spark to occur.
Before proceeding any further, you should check for diagnostic trouble codes. You would need an OBD 1 type code reader or scanner for your olds. Any stored codes may help you find the problem.
You can test the ignition system by checking for spark on a spark plug wire when the engine is cranking over. Pull the plug wire off a spark plug and put in a clean spark plug into the wire. Lay the plug so the threads are touching metal on the engine somewhere. Have someone crank the engine over and watch for a spark from the spark plug. If you have a blue, snapping spark when cranking, ignition is good.
One last note: since it dies when driving, there is a possibility that you have a malfunction in the pcm-the computer.

Jan 22, 2013 | Cars & Trucks

1 Answer

My 1994 cavalier lost spark to cylinders 1 and 4. Which components are directly related to ignition spark and timing? What about the camshaft sensor?


You listed all the components involved in spark timing and control- coil, ignition module, pcm, wires, plugs, crank sensor, and cam sensor.
Cylinders 1 and 4 have the same coil for both, so concentrate on that coil. You still have a good blue spark on cylinders 2 and 3? If you have spark there, I don't know about the cam sensor-I think it would be good if it works at all. You need to check if you have 12 volts power to the coil for 1 and 4.

Nov 20, 2012 | 1994 Chevrolet Cavalier

1 Answer

Car will crank there is no spark have replaced coil and condenser


Test the ignition system output, ignition systems can vary in configuration but operate on the same principal. Ignition systems can consist of a coil, pick up coil, crank angle sensor, cam angle sensor, spark plugs, spark plug wires, distributor cap, ignition rotor and a distributor and any variations of these components. An ignition coil is a voltage stepper coil that transforms a low voltage (12 volts) signal into tens of thousands of volts needed to jump the gap of the spark plug.

This coil is activated by an ignition module triggered by using the camshaft/crankshaft angle sensor; timing is adjusted by the PCM (computer).This primary electrical signal is generated by the PCM which calculates spark timing by using a variety of sensors including coolant temperature, mass air flow, and oxygen sensors. Go to 2carpros.com for a video on how to check this using a 12v light tool. On the engine repair section search, type, "engine cranks but will not start." If my answer helpe you, please leve good feedback. thanks

Nov 15, 2011 | 1992 Toyota Corolla

1 Answer

1991 Mazda 626 DX dies suddenly after running for 10 minutes.


Hello, It sounds like an engine ignition control module gone out or a coil. They get hot and quit working after a short period of time, cool off then work again till they get hot.
Is the ignition system pointless electronic or does it have points? Are you getting any fire at all now to the cylinders? Does the tach in the vehicle show any RPM's during cranking? Do you have voltage at the positive side of the ignition coil? Does the coil meet the ohm ratings for that years vehicle ignition? Does the vehicle have oil in it so the oil pressure sensor allows the engine to run, this may not be an option on your particular vehicle? You can check most of this out with a volt/ohm meter. Check your voltages before starting the vehicle, during running and after it quits to see where the loss is. Just don't get near the center tap of the coil or you will get a rude awakening and/or serious injury. Good luck, RAC

Apr 05, 2009 | 2000 Mazda 626

15 Answers

Replace neon 2.0 with a 2.4 enine. wont spark in start mode.


The problem is the body ground control module.

Feb 16, 2009 | 2006 Dodge Neon

3 Answers

Engine cuts off in traffic when car slows.


Sounds like it could be an ignition module breaking down.

Oct 18, 2008 | 1999 Dodge Durango

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